Beer, D. F. (1997). A guide to writing as an engineer. New York: John Wiley and Sons.
Παραπομπή Chicago StyleBeer, David F. A Guide to Writing As an Engineer. New York: John Wiley and Sons, 1997.
Παραπομπή MLABeer, David F. A Guide to Writing As an Engineer. New York: John Wiley and Sons, 1997.
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